Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

Viscosity variation of the fluids may cause channeling/flooding
Packing may be crushed due to thermal expansion/contraction of the components of the equipments
None of these
Pressure drop in the equipment will be very high

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Mass Transfer
Pick out the wrong statement pertaining to leaching.

Door classifier can be used for leaching of coarse solids
Fine solids can not be leached in a Pachuka tank
Vegetable seeds can be leached in either of Bollman extractor, Rotocel or Kennedy extractor
Very high temperature is not needed for the leaching of sugar beet

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